Example Program to calculate Factorial

[Dieter]

(02-02-2018 07:20 PM)Thomas Okken Wrote:  ROM space was definitely limited. The HP-25 ROM is full to the last byte.

Edit: Full to the last byte? There are 16 (!) NOPs in the listing. Once even five in a row. ;-)
And finally after 40 years they have been put to good use, fixing a strange behaviour in the HP25 number entry routine.

(02-02-2018 07:20 PM)Thomas Okken Wrote:  And finally, the full set of 12 as it exists on the 42S would have been hard to fit on the HP-25 keyboard.

OK, I see the problem with limited ROM space. But there's plenty of room on the keyboard – there are eight (!) unused locations. STO and RCL even do not have any shifted functions at all. But if there is no room for functions to fill these positions... #-)

Dieter